Sere's costume consists of white desert-tribal style robes with fine patterning on them. His mask was a featureless plate with light blue lenses over the eyes. He is surrounded by a pale nimbus of mist that he draws out with his power.[3]

Sere has the ability to violently draw in moisture from his environment,[4] allowing him to stun[5] or kill his targets.[6] This ability ignored forcefields and armor.[4] This limited hydrokinesis, effectively targeted dehydration, made him dangerous to Taylor's swarm.[7]

Can do so in a long tight cone-shaped "blast"[6] or a tight field around him.[8] The moisture he extracts remains floating around him.[9]

Specifically recruited to Bockton bay as a counter for Skitter's abilities.[11] Guarded Arcadia High with Adamant when students were going there to get early admission and instruction. He was caught and wrapped up by Skitter when Director Tagg ordered Dragon and Defiant to capture the teenage villain. He had some initial success but the teenage villain rapidly adapted to his abilities.[9]

Was incapacitated by Skitter again when she made a retaliatory strike on the PRT. This time he was caught before he could get out and engage the villain personally.[12]

Was there when Skitter surrendered and helped Kid win make drones adapted to use his abilities.[13][14]

Went out on patrol with Dovetail to make sure everything was calm after Skitter surrendered,[15] watched the announcement of Alexandria's demise along with Dovetail.[16]

↑Sere, I did know about, but only because I'd once come across a cell phone video of him brutally taking down a number of thugs, posted online somewhere, months ago. - Excerpt from Chrysalis 20.2

↑He wore a kind of nomadic, desert-tribe style of robe, all in pristine white with a fine pattern embroidered onto it. His mask was more stylistic than representing anything, a solid white plate with light blue lenses for the eyes and no opening for his nose or mouth. What made him stand out was the moisture that flowed from the gaps in his handwraps and from around his mask. It swirled around him like a breath outdoors in winter, pale. - Excerpt from Chrysalis 20.2

↑ 4.04.1Some capes shot fire from their hands. Sere was the opposite – he could draw moisture to himself with surprising speed and violence. It didn't matter if a foe was armored or behind a forcefield, he could dehydrate them in a flash. - Excerpt from Chrysalis 20.2

↑I was dimly aware of Sere striking down one of the decoys. The moisture in the air zipped to his hand, and nearly half of the decoy was ruined, the bugs dazed or unable to move. - Excerpt from Chrysalis 20.2

↑ 6.06.1The bugs were being sucked dry of moisture as they got too close to Sere; I wouldn't be able to disable him with just my swarm. He drew more water from a cloud of bugs, desiccating and killing hundreds.
The number that died was indicative of something, though. As devastating as the attack was, the effect didn't cover a massive area. It was a roughly cone-shaped area, with a long reach, but narrow breadth. - Excerpt from Chrysalis 20.2

↑It would be free-floating capes in the vicinity of the city, and since we know that Dovetail, Adamant and Sere were available not too long after, we can assume that these guys bolster the Brockton Bay Protectorate. - Wildbow on Reddit

↑Sere was indoors, along with Triumph. Binding Sere had been a first priority, and I’d achieved it in much the same way. He’d done what he could to target the bugs managing the threads, and to disentangle himself, but time spent on that was time he wasn’t moving outdoors and shooting me or one of the dogs. - Excerpt from Imago 21.1

↑"See to it. Where do things stand with the defense system against the bugs?"